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Israel, which regards Iran's nuclear program to be a considerable threat, is widely believed to have nuclear weapons itself.

Last month, Israeli Prime Minister Benjamin Netanyahu said a nuclear-armed Iran would destabilize the Middle East and threaten the entire world by triggering an arms race and supplying catastrophic weapons to terrorists.

"The goal is to prevent Iran from developing nuclear weapons," Netanyahu said, adding that most governments in the Middle East, Europe and elsewhere agreed.

"It's not merely an interest of Israel," he said.

Pressed on whether Israel would launch a unilateral attack against Iranian nuclear facilities, Netanyahu said Israel "always reserves the right to defend itself."

He said, "We are threatened as no other people are threatened," he said.